<template>
  <div>
    <!-- 工作日历, 年和月 -->
    <div class="select-box">
      <el-select v-model="currentYear" size="small" style="width: 120px; margin-right: 10px" @change="changeData">
        <!-- 年份取给定年份的, 前五年 + 后五年 -->
        <el-option v-for="item in yearList" :key="item" :label="item" :value="item" />
      </el-select>
      <el-select v-model="currentMonth" size="small" style="width: 120px;" @change="changeData">
        <el-option v-for="item in 12" :key="item" :label="item" :value="item" />
      </el-select>
    </div>
    <el-calendar v-model="currentDate">
      <!-- date 展示的是当前这一天对应的时间 -->
      <template #dateCell="{date}">
        <div class="date-content">
          <span class="text">{{ getDate(date) }}</span>
          <span v-if="isWeek(date)" class="rest">休</span>
        </div>
      </template>
    </el-calendar>
  </div>
</template>

<script>
export default {
  props: {
    startDate: {
      type: Date,
      default: () => {
        return new Date()
      }
    }
  },
  data() {
    return {
      currentYear: null, // 当前年份
      currentMonth: null, // 当前月份
      currentDate: null // 当前日历选中的值
    }
  },
  computed: {
    // 当前的前五年 和 往后的后五年
    // 要遍历的年的数组
    yearList() {
      // const startYear = this.currentYear - 5
      // const endYear = this.currentYear + 5
      // const year = []
      // for (let i = startYear; i <= endYear; i++) {
      //   year.push(i)
      // }
      // return year
      return Array.from(new Array(11), (item, index) => {
        return this.currentYear + index - 5
      })
    }
  },
  watch: {
    currentDate(newVal) {
      const date = new Date(newVal)
      this.currentYear = date.getFullYear()
      this.currentMonth = date.getMonth() + 1
    }
  },
  created() {
    this.currentYear = this.startDate.getFullYear() // 得到当前年份
    this.currentMonth = this.startDate.getMonth() + 1 // 当前月份
  },
  methods: {
    changeData() {
      // console.log(this.currentYear)
      // console.log(this.currentMonth)
      this.currentDate = new Date(this.currentYear, this.currentMonth - 1, 1)
    },
    /**
     * 获取当前天
     * @param {*} date
     */
    getDate(date) {
      return new Date(date).getDate()
    },
    /**
     * 判断是否是周末
     */
    isWeek(date) {
      // console.log(new Date(date).getDay()) // 0-6
      return [0, 6].includes(new Date(date).getDay())
    }
  }
}
</script>

<style lang="scss" scoped>
  .select-box {
    display: flex;
    justify-content: flex-end;
  }

  ::v-deep .el-calendar-day {
    height:  auto;
   }
  ::v-deep .el-calendar-table__row td::v-deep .el-calendar-table tr td:first-child, ::v-deep .el-calendar-table__row td.prev{
    border: none;
   }
  .date-content {
    height: 40px;
    text-align: center;
    line-height: 40px;
    font-size: 14px;
  }
  .date-content .rest {
    color: #fff;
    border-radius: 50%;
    background: rgb(250, 124, 77);
    width: 20px;
    height: 20px;
    line-height: 20px;
    display: inline-block;
    font-size: 12px;
    margin-left: 10px;
  }
  .date-content .text{
    width: 20px;
    height: 20px;
    line-height: 20px;
   display: inline-block;

  }
  ::v-deep .el-calendar-table td.is-selected .text{
     background: #409eff;
     color: #fff;
     border-radius: 50%;
   }
  ::v-deep .el-calendar__header {
     display: none
  }
  </style>
